I don't remember when the change to log attempts to grab locks landed.
Maybe your version doesn't have that. In that case, my guess is that
it's attempting to grab a lock to fiddle with iptables, but something
is already holding that lock. There should be a nova directory in
/var/lock. Can you provide an "ls - l" of that dir?

-- 
Soren Hansen        | http://linux2go.dk/
Ubuntu Developer    | http://www.ubuntu.com/
OpenStack Developer | http://www.openstack.org/

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